Final answer:
The amount owners have paid-in (capital stock & additional paid-in capital) is considered contributed capital.
Step-by-step explanation:
When a person buys shares of a company's stock, they contribute to what is known as the company's contributed capital. This includes the amount owners have paid-in, which consists of the capital stock and additional paid-in capital. On the other hand, retained earnings are the portion of a company's profits that are reinvested back into the company, rather than being distributed to shareholders as dividends.